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Opt Express. 2007 May 28;15(11):6798-808.

Heisenberg limited Sagnac interferometry.

Abstract

We show how the entangled photons produced in parametric down conversion can be used to improve the sensitivity of a Sagnac interferometer. Two-photon and four-photon coincidences increases the sensitivity by a factor of two and four respectively. Our results apply to sources with arbitrary pumping and squeezing parameters.

PMID:
19546991
[PubMed]
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